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OpenStudy (anonymous):
cos(C) = -0.15 how to solve will medal and fan
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OpenStudy (anonymous):
This is not a right triangle.
OpenStudy (anonymous):
\[\large \sf cos(C)=-.15 \Huge \Rightarrow \large C=acos(-.15)\]
OpenStudy (anonymous):
Can you do inverse cosine on a triangle that is not a right triangle?
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